org.cloudgraph.hbase.filter

Class PredicateRowFilterAssembler

java.lang.Object

org.plasma.query.visitor.DefaultQueryVisitor

org.cloudgraph.query.expr.ExpresionVisitorSupport

org.cloudgraph.hbase.filter.FilterHierarchyAssembler

org.cloudgraph.hbase.filter.PredicateVisitor

org.cloudgraph.hbase.filter.RowPredicateVisitor

org.cloudgraph.hbase.filter.PredicateRowFilterAssembler

All Implemented Interfaces:

Assembler, HBaseFilterAssembler, PredicateFilterAssembler, org.plasma.query.visitor.QueryVisitor

public class PredicateRowFilterAssembler
extends RowPredicateVisitor
implements PredicateFilterAssembler

Processes a where predicate expression tree into a set of HBase row filters arranged within a hierarchy of HBase filter lists. The resulting filter list resembles the given expression tree with AND/OR MUST_PASS_ALL/MUST_PASS_ONE semantics representing the input. A filter list stack is maintained which mirrors the query expression being processed.

Since:

0.5

Author:

Scott Cinnamond

See Also:

CompositeRowKeyExpressionFactory, GraphRowKeyFactory, QueryVisitor, Query

Field Summary

Fields inherited from class org.cloudgraph.hbase.filter.RowPredicateVisitor

contextPropertyPath, rowKeyFac

Fields inherited from class org.cloudgraph.hbase.filter.PredicateVisitor

contextHBaseCompareOp, contextOpWildcard, contextProperty, contextType, contextWildcardOperator

Fields inherited from class org.cloudgraph.hbase.filter.FilterHierarchyAssembler

filterStack, params, rootFilter, rootType

Constructor Summary

Constructors

Constructor and Description
PredicateRowFilterAssembler(org.plasma.sdo.PlasmaType rootType, StoreMappingContext mappingContext) Constructor sets up a CompositeRowKeyExpressionFactory for the given root type.

Method Summary

Modifier and Type	Method and Description
void	assemble(org.plasma.query.model.Where where, org.plasma.sdo.PlasmaType contextType) Takes a query where clause containing any number of predicates and traverses these as a {org.plasma.query.visitor.QueryVisitor visitor} only processing various traversal events as needed against the root type.
void	clear()
protected void	log(org.plasma.query.model.Where root)

Methods inherited from class org.cloudgraph.hbase.filter.RowPredicateVisitor

end, start, start, start, start, start, start

Methods inherited from class org.cloudgraph.hbase.filter.PredicateVisitor

start, start

Methods inherited from class org.cloudgraph.hbase.filter.FilterHierarchyAssembler

filterTokens, getFilter, getParams, popFilter, pushFilter, pushFilter

Methods inherited from class org.cloudgraph.query.expr.ExpresionVisitorSupport

getChildExpressionCount, getChildExpressions, getLogicalOperatorCount, hasChildExpressions, hasWildcard

Methods inherited from class org.plasma.query.visitor.DefaultQueryVisitor

end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, getContext, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.cloudgraph.hbase.filter.HBaseFilterAssembler

getFilter

Constructor Detail

PredicateRowFilterAssembler

public PredicateRowFilterAssembler(org.plasma.sdo.PlasmaType rootType,
                                   StoreMappingContext mappingContext)

Constructor sets up a CompositeRowKeyExpressionFactory for the given root type.

Parameters:

rootType - the root type

See Also:

CompositeRowKeyExpressionFactory

Method Detail

assemble

public void assemble(org.plasma.query.model.Where where,
                     org.plasma.sdo.PlasmaType contextType)

Takes a query where clause containing any number of predicates and traverses these as a {org.plasma.query.visitor.QueryVisitor visitor} only processing various traversal events as needed against the root type.

Specified by:

assemble in interface PredicateFilterAssembler

Parameters:

where - the where clause

contextType - the context type

See Also:

QueryVisitor, Query

clear

public void clear()

Specified by:

clear in interface Assembler

Overrides:

clear in class PredicateVisitor

log

protected void log(org.plasma.query.model.Where root)

Overrides:

log in class FilterHierarchyAssembler